ref. https://github.com/passcod/cargo-watch/issues/127
This adds support for a dedicated ignore file by the name of `.ignore` a
la `fd`, `ripgrep`, et. al.
This purely just mimics what `Gitignore` is doing except it doesn't
ignore `.git` directories. There might be more I need to tweak and the
interface might be too obtuse, but this is a first pass.
I've also added a `--no-ignore` flag which ignores both `.gitignore` and
the dedicated `.ignore`. It might make sense to add a specific flag that
ignores `.ignore` but respects `.gitignore` to support the old
behaviour, but I wasn't sure what to name it.
issue #59
- Keep track of `notify::op::Op`s associated with each updated path
- Collect paths into `notify::op::Op` categories and pass them on as
environment vars
- Set a COMMON_PATH and use relative paths if more than one unique
path was touched
